levin



N. u. LEVIN. MINING AND LOADING MACHINE.

APPLICATION FILED AUG. I. 1913. RENEWED llIL'Y I7. 1920'.

f aJ m e a n m 6 r 9...... 0 .INH M 7 w QQ MN .mm. v MW .WNNL MNM. ,NNN mwm. ANAH \M..M.\WM my f \N Awww/ n 1m U, @@N D D o o o .nm wm ma www D; If MK wm. v .@H/ Nm@ awww L NQ MN. MSN MSN QQQN hk Nw.

. Nm. QMNQQN. Nw@ NMNN @n 9v mm N. D. LEVIN.

MINING AND LADlNG MACHINE.

APPLICATION FILED Aue. I. 1913. IIENEwIsD1uIYI7,192o.

N NI .WR NI wN RQN m wm SI mwllw mm1 m Q" A .I l

n v 1 f m 1 I I I 1 .|I|I||1| r 7, w I 1v I um @o U 1 Q 9B. IKQ In VUM IIIIIIIIIIIIIIIII ILIIIII I v 3 M M L d uw I D D O Hill c) Ny D. LEVIN.

MINING AND LOADING MACHINE.

APPLICATION FILED Aue, II 1913. IIEIIIwEIIInu/17.1920l N. D. LEVIN.

MINING AND LOADING MACHINE.

APPLICATION FILED AUG. I. 1913. RENEWED IuLY I7, 1920.

N. D. I EVIN.

MINING AND LOADING MACHINE.

APPLICAT10N-F|LED Aus.|,1913. RENEwED JULY x7, 1920.

Patented May 17, 1921.

L Q SNK N. LEVIN.

MINING AND LOADING MACHINE.

APPLxcATloN man -Aue.1. 191s.

WITNESsEsf Eateuted May l92l.

INVENTOR. @M4 I QM I/favw;

WI TNESSES A TT ORNE Y.

N. D. LEI/III.

NININ@ AND LoADlNG MACHINE.

APPLICATION FILED AUG, I, I9|3 RENEWED JULY I?, I920.

Patented May 17, 1921.

I3 SHEETS-SHEET 8.

N, D. LEVIN.

NIINING AND LOADING MACHINE. APPLICATION FILED UGII 19131 RENEWE JULY 17. 1920- I 1,8,860 Faten Mit'y 17, 192.1.

13 SHEETSFSHEET 0I N. D; LEVIN.

MINING AND LOADING MACHINE.

APPLICATION FILED Aut-L1, i913. Renewal) uw n, 1920.

Patented May 17, 1921.

13 SHEETS-SHEET III I GII a Y WITNESSES ATTORNEY.

N. D. LEVIN,

MINING AND LOADING MACHINE. APPLICATION FILED Aue.1,1913. RENEWED 1uLv11.192o.

Patented May 17 1921.

13 SHEETSSHEET I2.

WSW

N. DA LEVIN.

MINING AND LOADING MACHINEv 'APPLICATION FILED AIIG.I, I9I3. IIENEWED IuLY II. Iszo 1,378,360. Patented May 17,1921.

, x @n m l zzz :ma

UNITED STATES OFFICE.

NILS D. LEVIN, OF COL'MBUS, OHIO, ASSIGI'OR 'IO THE JEFFREY MANUFACTURING COMPANY, OF COLUMBUS, OHIO, A CORPORATION OF OHIO.

'MINING AND LOADING- MACHINE.

Specication of Letters Patent.

Patented May 17, 1921.

Application filed August 1, 1913, Serial No. 782,522. Renewed July 17, 1920. Serial No. 397,155.

T0 all whom 'it may concern Be it known that l; Nine l). Levin, a citizen of the United States; residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Mining and Loading Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvement in mining machines of the type adapted for under-cutting coal, breaking it down and loading it into cars.

I am aware that machines intended to perform these functions have been heretofore proposed and constructed and I do not therefore broadly claim as a part of my present invention breaking down and loading means in combination with an undercut'ting means. I am also aware that it has been heretofore proposed to provide in a cutting and loading machine simultaneously movable horizontal under-cutting devices and parallel vertical shearing devices; to provide reciprocating breaking oown tools mounted upon a frame worl which can be oscillated about a horizontal axis; to provide a car loading conveyer which is pivoted to the main frame for movement about vertical axis; and to provide ropes or cables together with winding drums for moving the machine as a whole. None of the foregoing features is broadly claimed as a part of this invention.

However, by my present invention I have provided a number of features which are new in machines of this character, and the objects of the invention therefore are to provide the following improved features among others: improved rope controlled mechanism for moving the cutter device bodily with respect to the bed frame; improved shear cutting mechanisms adapted to out kerfs having vertical forward edges; improved breaking down devices and improved actuating and controlling mechanism therefor; means supplemental to the main conveyor for gathering and loading the slaclr from the under-cutting means; means independent of the main power devices' for driving the rear swinging conveyer; improved rope controlled means for moving the machine as a whole from one position to another; improved power transmitting devices for driving the various operative parts; improved devices whereby the various Darts of the machine may be readily controlled by the operators; and various other features of novelty and advantage which will be readily understood from the .following description, and from the drawings.

In the accompanying drawings l have shown one embodiment of my invention. However, l desire it to be understood that variousmodifications as to detailsv may be made within the scope of the appended claims without departing from the spirit of my invention.

Figure l is a plan viewof a machine embodying my invention; i

F ig. 2 is a side elevation;

Fig. 3 is a side view partly in section, and partly in elevation of the forward end of the machine, taken on the opposite side from F ig. 2;

fig. 4 is a side view partly in'section and partly in velevation of the central part of the machine;

5 is a side view partly in section; and partly in elevation of the rear part of the machine;

l? ig. 6 is a fragmentary longitudinal sectional view taken along the lines 6-6 of Figs. 8 and 9;

Fig. 7 is a cross sectional view taken along the line 77 of Fig. 3;

Fig. 8 is a cross sectional viewL taken along the line 8-8 of Fig. l;

Fig. 9 is a cross sectional view taken along the lines 9 9 of Figs. 4 and 6;

Fig. 10 is a cross sectional view taken along the line 10-10 of Fig. 5;. Y

l? il is a plan view of the main frame a side view of the main frame a side view of the main cutter i6 is a side view of the parts shown in Fig. i5

7 l" 1g. l is fragmentary plan view partly in section of the mechanism for adjusting the tension in the chain of the under-cutting mechanism;

Fig. 18 is a fragmentary cross sectional view taken along the line 18-18 of Fig. 3;

Fig. 19 is a sectional View of a part of the controlling apparatus for the breaking down mechanism Fig. 20 is a fragmentary view partly in section of the magnetic mechanism for controlling the pick devices;

Fig. 21 is a detail view of the adjusting screw for'the slack conveyer;

Fig. 22 is a fragmentary sectional view along the line 22-22 of Figli;

Fig. 23 is a fragmentary sectional view along the line 23-23 of Fig. 6;

Fig. 24 is a fragmentary sectional view along the line 24-211 of Fig. 6;

Fig. 25 is a diagrammatic plan view showing the feeding mechanism, the other parts being removed for the sake of elearness;

. Fig. 26 is a detail view of the clamp for holding the pullback rope;

Fig. 27 is a vertical sectional view through the clamp shown in Fig. 26;

Fig. 28 is a fragmentary sectional view taken along the line 28-28 of Fig. l;

Fig. 29 is a fragmentary side view partly in section7 and partly in elevation of. the parts shown in Fig. 28;

Fig. 30 is a detail view of a part of the feed mechanism;

Fig. 31 is a diagram of electrical connections;

Figs. 32-36 are diagrammatic views illustrating the manner of using the machine.

Stated very briey the machine comprises five principal operative parts. These are the under-cutting mechanism indicated in Figs. 1 and 2 by A; the vertical shearing devices B B; the breaking down mechanism C; the primary conveyer D, and the secondary loading ccnveyer E.

l The several principal parts are coperatively' connected together and are mounted upon a main frame 1, which is shown in detail in Figs. 11 and 12. This main frame is supported upon a pan or shoe which rests directly upon the floor of-the mine room or entry in which the machine is being op# erated. The frame is bodily movable with respect to the pan in a manner to be Idescribed.

Supported on the mainframe casting 1 is a relatively movable cutter frame 2 preferably formed of cast steel. The cutter frame is shown in detail in Figs. 13 and 14e, and it will be noted that it is generally triangular in outline. As shown in Fig. 7, the cutter frame 2 is provided with horizontal Hanges 3 which are slidable in suitable guides 3a formed on the under side of the main horizontal wall of the frame casting 1. The cutter frame 2 is provided around its edges with a groove adapted to receive and guide an endless chain 8 to which are secured cutting bits 9 2). The chain groove along the sides of the frame ig, formed in part by the plates 7--`T, and at the front by the plates Til-T, llt the front the cha-in 8 passes over a hardened wear plate 7b. At the rear the chain passes around and is enga-ged by the drive sprocket wheel 10 which is mounted on the main frame to receive power in a manner to be hereinafter described.

As before stated the cutter frame 2 is slidable longitudinally with respect to the main frame 1. This adjustment of the cntter frame is for the purpose of regulating the tension in the cutter chain. The adjusting mechanism is clearly shown in Figs. 7 and 17. In the cutter frame there is formed a recess in which is rigidly mounted a screw Il. A. bracket Ll, which is secured to the frame 1, has depending arms with apertures through which the screw lloofel y passes. ab is a combined nut a' d worin wheel mounted on the screw l between the depending arms of bracket Ll, and this worm wheel is engaged by a worm flic on a shaft ld, which is mounted in the bracket lf2 'l`he end of the shaft la is squared to receive a cranked socket wrench au. ly means of the socket wrench 4E@ an operator at the side, of the machine can move the parts which have been described, and can by means of them move the cutterv frame 2 longitudinally with respect to the main frame l, thereby tightening or loosening the cutter chain 8.

Fositioned at opposite sides of the main frame 1 and longitudinally slid-able thereon are brackets 13-13 to which are secured vertical cutter frame plates 11--14a These parts are clearly shown in Figs. 3 and T. `Fach of the brackets 13 has at its outer edge a flange 15 engaging a rib lb on the main frame, and at its` inner edge a flange 1'? engaging a rib 18 on the main frame. At 17 there is on each bracket a downward extending rib which engages a vertical wall on the main frame. It will be clear that by means of the flanges or ribs 15; 1T and 17 the brackets 13S-13, and consequently the plates lei-Jill, are held against lateral or vertical movement, at the same time being free for longitudinal movement within certain limits. As shown in F ig. 3 the plates lll-14e are substantially triangular in outline. Each plate has a substantially vertical forward edge and is provided at each of its forward corners with an idler sprocket wheel 23 which is journaled on a ball-bearing- 24 secured to the frame plate by means of two small plates 2li?. Arranged to pass around the respective plates 1sl-1-l are endless cutter chains 2li-25. Each chain 25 is made up of two different kinds of links 26-26 and 2'1"*27. The links l (ll) 26-26 are provided with apertures adapted to receive the shanks of cutting bits 23--28, which are held in place by means of wedges 28a-28f As shownl in Fig. 7 the bits 2823-are of differentkinds some of them having wide cutting edges and others bcing4 pointed.A Each of the links 27-27 is made up of two flat plates which extend inward at their inner edges to embrace the frame plate 14, and thus serve to guide the chain. As before stated the chains 25-'25 pass around the respective plates 14-14 and engav'e the respective sprocket wheels 23-23. t the rear the chains 14-14 pass over sprocket wheels 29-29, which are mounted on the main frame to receive power in a manner to be hereinafter described. For supporting the chains 25-25 at the lower sides of the iframes 144-14 l provide guide plates 29a--29' as shown in Figs. 3 and 18. These plates serve to prevent the chains from sagging and can be as long as desired.

On releasing the bolts 20, the vframes 14--14 can be moved longitudinally with respect to the main frame 1 by means oit screws13, of which one is shown in Figs. 3 and 18. lt will be observed that the screw 13u is mounted in a bracket 13b secured to the bracket 13, and is arranged to engage with the end of the main frame 1. l turning the screws 13ay the brackets 13-13 and the plates 14-14 can be moved forward to tension the chains 25*25. The brackets 13-13 can be locked in adjusted position by means of the bolts 20-20, which extend through the brackets and through slots 20a-20a in the main trame casting.

Attached to the edges of the cutter trame 2 are protecting plates 11 which extend above the path ot the cutters 9-9, and contact with the plates of the shearing cutter heads. These plates 1l are clearly shown in F ig. 18. They serve to prevent pieces of coal Jfrom becoming jammed between the cutters or bits of the two chains, thus damaging the machine.

lt will be observed that in the drawings l have shown the forward ends or heads of the under cutter and shearing cutter as terminating in di'liierent transverse vertical planes. l desire it to be understood, however, that as to this there may be varia tions. Under most conditions it is 'hound preferable to extend the under-cutting mechanism six inches or more beyond the shearing mechanism. rlhe reasons tor this will be made more iully apparent hereinafter. will also be observed that the uuder-cutting mechanism is arranged to form a relatively wide kerf, this being necessary Ylor the admission of the conveyer to be hereinafter referred to. The shear cutting' mechanisms are arranged to cut as narrow kerfs as possible.

rllhe mechanism for breaking down the coal above the under-cutting mechanism and between the shearing mechanisms is, as before stated, indicated as a whole by C. lt comprises a main vertically oscillatory framework which is made up oit two tubular legs 30 and 31 which are arranged longitudinally at the sides of the machine, and are connected together at their forward ends by means of a cross member 32. As shown in Figs. 4 and 9 the legs 30 and 31 are provided at their rear ends with trunnions which are journaled in bearinws 34-34 on the upward extending parts 35-35 of the main iframe 1.

Bolted to one of the said legs, as for instance 30, is a downward projecting arm 3G which has at its lower end a rope sheave 37. Bolted to the part 40 oi the main frame 1 adjacent the arm 36 is a bracket 40a having at its upper end a rope sheave 41. A rope 38 passes over the sheaves 41 and 37, and has its end secured at 39 to the bracket 40a. From the sheave 41 the rope passes downward under the sheave 42 secured to the main frame at 42a, and to a winding drum 43. lt will be clear that when the drum 43 is turned by means of the devices to be described, the rope 38 will be wound or unwound and the framework for the breaking down mechanism will be raised or lowered. Bolted to the other leg 31 of the frame work is a bracket 44 to which is secured the upper end of a coil spring. 45. rll`he lower end of this spring is seated ina recess 46 of the main frame. This spring 45 serves to press upward on the oscillatory frame work and to aid in supporting it, thus assisting in the movement of it by means oit the rope 33.

Slidably mounted within the hollow legs 30 and 31 are tubes 47-47. The tubes 47-47 are joined at their forward ends by means of a cross member 48 having a plurality of sockets in which pick bits 49-49 are secured by means of keys 49a*49. These keys 49a are shown in Figs. 1 and 20 and extend through apertures 49b in the cross member 48, and engage suitable notches in the shanks of the bits.

The openings in the forward ends oit-the tubes 47--47 are closed by means of screw threaded plugs 50 against vhich abut springs 51 contained within the tubes. 'l` he rear ends of the springs 51 abut against pistons 52 secured to piston rods 53. rll`he pistons 52 are slidable in the tubes 47, and the rear ends of the piston rods are secured to cross heads 54, which are slidable in the hollow legs 30 and 31.' Springs 55 are interposed between the rear sides et the pistons 52, and the rear end walls of the tubes 47. `Connected to the cross heads 54 by means of wrist pins 54aM are connecting rods 56 which are pivotally connected at their rear ends at 57 to rocker arms 58. These rocker arms 58 are connected together at their lower ends by means of a cross member 58L and arejournaled in bearings on the main frame by means of trunnions 59-59. 61 is a connecting rod pivoted at its rear end at 60 to one of the rocker arms 58 preferably that on the near side as shown in Fig. 4. The forward end of the connecting rod 61 is mounted at 62 on a crank pin which will be hereinafter referred to.

Embedded in the cross member 32 of the oscillatory frame is an electro-magnet 65 and secured to the cross member of the reciprocatory frame is an armature 66 adapted to be engaged by the magnet. The armature 66 can be adjusted with respect to the cross member 48 by turning the nut 66a. A spring 66h serves to normally hold the armature at its outermost position, and at the same time permits yielding in case the parts are moved to bring the armature into contact with the magnet.

32a-32a are rubber buffers or cushions positioned in sockets in the cross member 32 and adapted to engage the cross member 48 to take up shock.

When power is transmitted through the connecting rod 61 to oscillate the rocker arms 58 and reciprocate the connecting rods 56 and the pistons 52 power will be trans mitted by means of the springs 55 and 51 to reciprocate the tubes 47 and the cross member 48 together with the picks mounted thereon. lVith the parts operating in this way the picks would be given a relatively slow reciprocatory motion and would be able to strike but relatively feeble blows upon material with which they might come in contact. In order that the speed of the pick mechanism on its forward stroke may be increased to increase the force of the blows struck by the picks the magnet 65 and armature 66 above referred to are provided. When the reciprocating mechanism reaches its inner extremity of movement the magnet 55 is energized, and in this way the pick mechanism is temporarily held against outward movement. However, the outward movement of the pistons 52 at once takes place, the result being that the springs 51 are compressed. At about the time that maximum compression is reached the magnet 65 releases the armature and the pick mechanism is' forced suddenly outward by the springs 51 and strikes a powerful blow against the face of the coal. The springs 55 serve to absorb the energy of the blow in case the picks' do not reach the coal, or in case the coal breaks down so easily as not to absorb the entire energy. They also cop- Vcrate with the buffers 32a-82a to absorb the shock incident to the normal return movement of the pick mechanism.

The electrical connections for controlling the magnet 65 are shown in Fig. 31. The

magnet is connected with the main source of current supply of the machine through the conductors 67 and 69, the conductor (57 being connected through the rheostat (5S. The conductor 70 is connected across the supply wires for the magnet, and can be used to short circuit the magnet and thus denergize it. Connected in the conductor 7() is an automatically acting switch 72 which consists of a strip 7 3 mounted on :L rotating disk, and adapted to contact with lingers 74. It will be clear that when the disk is rotated the circuit through the conductor 7 O will be completed and the magnet denergized. The disk 72 is connected to the operative parts of the machine in a inanner to be described, and is timed to doenergize the magnet at the proper intervals. 71-71 are normally closed switches which can be opened by means of the buttons` 75-75. rlhe switches 71-71 are located at convenient points on the machine so that an operator by opening them can maintain the magnet energized, and thus hold the pick mechanism against operation. If desired, means may be provided for locking' the switches 71-71 in open positions.

The main conveyer for the machine is of the endless chain scraper type and extends over substantially the entire width and the entire length of the main frame. 'lf he conveyer is shown in Figs. 3, 4, G and 7. It comprises two endless chains 75 which are joined at intervals by cross bars 76 which act as Scrapers. The chains pass around sprocket wheels 77 on the transverse drive shaft 7S mounted in bearing brackets 79 on the main frame 1. At Jthe front of the machine the chains 75 pass around sprockets SO on a transverse shaft 81 journaled in bearings 82 in the cutter frame 2. The upper strand of the conveyer travels over the surface of the plate S3 which is connected by means of suitable angle bars SBK-83 with side plates 84-84. Angle bars 85-85 are secured to the plates 84 84 above the upper strand of the conveyer and serve to protect the chains and hold them in position. rl`hc lower strand of the conveyer travels over the surface of a plate 86 which is secured to the plates 84-84 by means of angle bars 87-87. The conveyer trough formed by the vertical plates 84-84 and the horizontal and inclined plates 83 and SG is a rigid self supporting structure. rlhe trough is mounted at its rear end on the ears 79 of the bearing brackets 79 for the shaft 7S. The forward end is adjustably mounted in the cutter frame 2, the parts being so arranged that the entire forward end of the conveyer can extend into the kerf formed by the cutters 9 9. The position of the forward end of the conveyer with respect to the other parts is shown in Fig. 3, and in Figs. 15 and 16 the mounting for the forrests7 and of side walls 100 and 100% ward end of the conveyer is shown in detail. 82 represents as a-whole the bearing for one endy of the shaft 81. rlhis bearing is freely slidable in a pocket or depression 82a formed in the cutter frame 2. rlhe bearing 82 is also adjustable with respect to the main part of the conveyer trough, and adjustment can be effected by means of the screw 82". This mounting of the bearings 82 for adjustment both with respect to the trough, and with respect to the cutter frame makes possible the adjustment of the shaft 81 with respect to the conveyer frame to regulate the tension in the conveyer chains, and also makes possible the free movement of the cutter frame to effect tensioning of the cutter chain.

The main conveyer can be readily removed from the other parts of the machine. Ordinarily the roof of a mine is too low to permit the conveyer being lifted off over one side of the machine, and therefore provision is made for drawing it out at the rear end. The conveyer can be entirely freed from the other parts of the machine by disconnecting the bearing brackets 7 9 from the main frame, and by disconnecting the bearings 82 from the cutter frame. llhe whole conveyer mechanism can then be drawn directly rearward. Rollers 88 are provided for temporarily supporting the forward parts of the conveyer during such rearward movement. i

The rear or swinging conveyer is indicated by E in Figs. 1 and 2. r1`he active element of the conveyer is of the endless chain scraper type, and is similar to the active element of the main conveyor. rEhe two chains of the conveyer are indicated by 89-89 and the transverse scraper elements are indicated by 90-90. At the rear the chains 89-89 run over idler sprocket wheels 91 on the transverse shaft 92. At the forward end the chains run over idler sprocket wheels 911 on the transverse shaft 95. The shaft 95 is mounted in suitable bearings in the hopper casting 96. IThis casting 96 is formed with upward extending Haring walls 97 which are positioned and adapted to receive material discharged from the rear end of the main conveyer. Sprocket wheels 98 engage the lower strand of the conveyer chains 89-89 to drive the conveyer. The devices for mounting and driving the sprocket wheels 98 will be hereinafter described.

The trough for the swinging conveyer is made up of two-sections which are pivoted together for relative movement about a transverse horizontal axis. The forward section of the trough consists of a plate 99, on which the upper strand of the conveyer ihe lower sections 100 of the side walls are con tinuations 0f the flaring hopper walls 97 and are formed as integral parts of the main hopper casting 96. The rear parts 100aN of the side walls of the forward section of the conveyer trough are secured to the forward parts 100 and to the framework which comprises two pairs of structural steel sections 101 and 102 all of which are bolted or riveted at their forward ends to the main hopper casting 96. Vertical sections 103 connect the sections 101 and 102 near their rear ends. The bottom plate 99V of the trough is connected to the side walls in any usual or preferred manner. As before stated this plate serves to support the forward part of the upper strand of the conveyer. The forward part of the lower strand is supported in part upon the bottom wall of the main hopper casting 96, and in part on the angle bars 10dse'cured to the frame sections 102. rl`he bars 1011 terminate some distance from the sprocket wheels 98 and the conveycr element is permitted to sag at this place in order to allow for adjustment of the parts to be described.

At the rear ends of the structural steel members 102 are bearings for a transverse hinge shaft 105. Upon the ends of this hinge shaft 105 are mounted supporting arms 106, to the rear ends of which the trough for the rear section of the conveyer is secured. This trough extends substantially horizontally and is made up of the side plates 108-108 which Hare outward at their upper parts, and the transverse plates 109 and 110 for supporting respectively the upper and lower strands of the conveyer. These plates 109 and 110 are secured to the side plates by means of suitable angle bars and at 110u110a there are provided supplemental flanges for protecting the upper strands of the conveyer chains, and holding them in position. VlChe rear transverse shaft 92 is mounted in suitable bearings secured to the trough and can be adjusted longitudinally by means of the screws 92a. The forward ends of the supporting arms 106 are pivotally connected to the upper ends of rods 111. rThe lower ends of the rods are connected to a cross head 112 which is threaded on a vertical screw 113. This screw is mounted in a suitable bearing in a cross member 114 which extends between the frame members 101. A. hand wheel 115 is cured to the screw 113 and by turning the hand wheel the cross head 112 can be moved, thus causing the adjustment of the rear section of the conveyor to raise or lower the rear end thereof.

116 is a frame casting rigidly secured to the main frame casting 1. At 117 it is provided with a recess in which, by means of a ball bearing 118, there is mounted a pivot pin 119. The upper end of the pivot pin 119 is adapted to extend into a slot in the hopper casting 96., and a head on the pin serves to prevent upward movement of the hopper casting with respect to the :trame casting 116. A transverse lock bolt 119a serves to normally hold the hopper casting 96 against ylongitudinal movement with respect to the pin.v At 120 are rollers secured to the hopper casting 96, and adapted to rest upon a .curved rail 12021 which is concentric with the pin 119.V It will be clear that the rollers 120 coperate with the pin at 119 to support the entire swinging conveyer, at the same time permitting free oscillatory movement to one side or the other. The entire swinging conveyer can be readily removed by withdrawing the bolt 119, thus permitting the whole structure to be moved rearward to disengage the hopper casting 96 from the head of the bolt 119.

Mounted on the rear part of the structural trame work of the swinging conveyer is an electric motor 121 receiving its current through the iiexible conductor 122. Conveniently located on the conveyer trame at 123 is a snap switch for controlling the motor 121. The armature pinion 124 of the motor meshes with a spur gear 125 on a suitably mounted shaft 126. On the shaft 126 is a worm 127 which meshes with a worm wheel 128 on a transverse shaft 129 which also carries the sprocket wheels 98 before referred to. By means of this mechanism power can be transmitted from the motor 121 to drive the conveyer chains 89 in the direction indicated by the arrows in Fig. 5.

The slack from the main under-cutter will bel carried backward within the main frame 1, and will not be caught by the main conveyer. In order to pick up this slack and load it with the other coal a supplementary slack conveyer is provided, this is clearly shown in Figs. 4, 6, 8, 9, 22, 23 and 24. The active element of the conveyer is a chain which passes over a drive sprocket 141 mounted underneath the rear end of the main conveyer for rotation about a vertical axis. passes around an idler sprocket 142 which is mounted in a bracket which is slidable longitudinally of the machine. Secured to the chain 140 are perpendicularly extending flights 143-143 which serve to engage the coal cuttings `from the pan or sub-base near the point where they are dropped by the bits of the cutter chain. The flights 143 push the cuttings onto an inclined trough 144, and finally discharge them into the same hopper casting 96 which receives the coal from the main conveyer. A similar trough 144a is provided for supporting the return strand of the conveyer element.

The head sprocket 141 is journaled on` a stud 145 which is integral with a casting` 146 secured to the main frame 1 by means of bolts 147, which also hold the plate 147"l At the forward end the chain 140.

in place. A washer and cap screw 14S holds the sprocket in place. The front sprocket 142 is journaled on a stud 149 of the casting 150 and is held in place by means of a suitable guard 151. The casting 150 is supported for limited movement longitudinally ot the machine by an extension 152 which engages a suitable guide way formed on the, main casting 1. It is held against forward movement by the tension of the chain and against rearward movement by the screw 154.

The rear parts oit troughs 144 and 144 are supported by means of angle bars 155-155 Othel1 angle bars 156 156 are arranged parallel to the bars 155-155 and coperate with them to form guides for the chain 140. The bars 155-155 and 156-156 are secured at their rear ends to the parts 146 and 147a and at their forward ends to the castings 159 and 160. The casting 159 has near its forward end an upward projecting part Cross members 157 and 158 connect the rear parts of the opposite angle bars 155 and 156. The castings '159 and 160 are rigidly connected together and are also rigidly connected to the main frame by means of a foot 159 on the casting 159. The castings 159 and 160 have flanges 151)--159n and 16O--ll60a which aline .with

the angle bars 155 and 156 and serve as chain guides. At the lower end ot the conveyer are angle bars 159b-159" and 160L4 160". Those on the lett hand side as viewed in Fig, 24 are secured to the castings 150 and 151, and those on the right hand side are secured to the castings 159 and 160.

rlhe adjusting screw 154 above referred to is supported in an aperture in the extension 160', and in apertures in the casting 159. It is held against rotation by means of a key 154e, which is shown in Fig. 21. 161 is a nut mounted on the screw 154 in a recess formed in the casting 159. This nut 161 has formed upon it a bevel gear adapted to mesh with a similar bevel gear 162. This gear 162 is mounted on a short transverse shaft 163 which is inclined upward and held in. a bearing 163l on the main trame. The shaft is squared at its end, and adapted to be engaged by a socket wrench to be turned. An opera-tor by turning the shaft 163 can turn the nut 161 and thereby adjust thil screw 154 and the sprocket 142 to change the tension of the chain 140.

is the plate or pan upon which the main frame of the machine slidably rests. This pan 170 comprises a bottom plate 175, and side plates which are formed by angle. bars 176 and 177. The inner edges of the horizontal flanges of the angles 176 and 177 are positioned to engage the sides of the main frame casting 1, and to form a guide way for it. Attached to the vertical iianges of the angle bars 176 and 177 are supplemental guide strips 179 and 17 9a, which are normally out of engagement with the main frame casting, but are adapted to contact with it in case the casting for any reason jumps out of the main guide way.

The main frame is moved to advance the cutting and breaking down mechanisms into the coal by means of the rope controlled devices which will be described. These are shown in Figs. 9 and 25. For feeding the machine forward a feed rope 173 is provided which is connected to be wound upon a drum 171 mounted on the main frame. From the drum 171 the rope extends over a sheave 180 mounted on the main frame, and over a sheave 181 mounted at the forward end of the pan 170. A guide sheave 181'LL is positioned adjacent the sheave 181. After passing around the sheave 181 the rope eX- `tends backward to a sheave 182 mounted on the main frame and across to a similar mounted sheave 183. From the sheave 183 the rope extends forward to a point of attachment t0 the front end of the pan at 184. It will be clear that when the drum 171 is rotated the rope 173 will cause the mainframe and attached parts to move forward with respect to the pan, the tractive force being divided between the two sides.

174 is a rope for pulling the main frame and attached parts backward with respect to the pan. This rope is connected to the winding drum 172, and from the drum eX- tends backward between two guide sheaves 1.85-185. From the sheaves 185 the rope can extend to the right or the left and can be secured to one or the other of the hooks 185185, as shown in Fig. 25. lt will be clear that when the drum 172 is rotated the rope 174 will act directly to pull the main frame and attached parts backward.

The hooks 185-185 are secured to or formed as parts of castings 186--180 mounted at the rear corners of the pan 170. These castings 18S-180 are provided with rearward extending lugs 187-187 adapted to be engaged by lifting jacks or crow bars for handling` the machine and assisting in moving it about the mine. Mounted on the casting 186-186 are sheaves 18W-JSG21 over which the rope 174 can be passed when it is to be used for moving the machine as a whole laterally or otherwise ina manner to be hereinafter described.

rllhe drums 171 and 172 are mounted for rotation upon two stationary vertical shafts 1.90 and 191, the bottom ends of which are threaded into castings 192 and 193 suitably securcd to the bottom wall of the main frame casting 1. The shafs have suitable extensions 194 and 195 which engage apertures in the bottom plate of the main casting` to assist in preventing lateral displacement. rl`he upper ends of the shafts 190 and 191 are fitted into apertures in a plate 196. Set screws 197-197 assist in holding the shafts against rotation.

Freely journaled upon the shaft 191 is a sleeve 197a upon which is journaled the drum 172, the drum being supported on a ball bearing 198 which rests upon the hub 199. rlhis hub 199 is journaled on the shaft 191 and has secured to it an operating lever 200. rlfhe lower side of the hub 199 is formed with beveled, or wedge shaped teeth, shaped to copcrate with similar teeth formed on the casting 193. rl`he hub of the drum 172 is provided at 201 with an annular recess, and into this recess there extends a cylindrical flange 202 which projects downward from a collar 203 formed on the sleeve 197% Mounted in the recess 201 is a series of clutch disks alternately keyed to the hub of the drum, and to the flange 202 in the usual manner. When the lever 200 is moved to turn the hub 199 in one direction, the teeth on the bottom of the hub co-act with the teeth on the casting 193 to lift the hub and the drum, thus pressing the clutch disks together to cause the transmission of power from the sleeve 197L to the drum. 1When the lever 200 is moved. to turn the hub in the other direction the drum is lowered and the clutch is released. Fitted to the upper part of the sleeve 197L is a spur gear 2047 and also a worm gear 205. 206 is a nut on the shaft 191 and between this nut and a shoulder on the shaft is a ball bearing 207 upon which rests a ring 208 which is secured to the sleeve 197 a by the screw bolts which secure the gears 204 and 205.V rllhe ball bearing 207 thus serves to support the gears and the sleeve. Formed on the drum 172 is a cylindrical flange 209, which forms an oil well iin which the clutch is contained.

The drum 171 is mounted and driven similarly to the drum 172. 210 is a sleeve rotatably mounted on the shaft 190, and upon this sleeve the drum 171 is journaled. The drum rests upon a ball bearing 211, which in turn rests upon a hub 212 carrying an operating lever 213. rlChe hub 212 is formed with wedge shaped teeth similar to those on the hub 199, and these teeth coact with similar teeth on the casting 192. It is to be noted, however, that the teeth on the parts 212 and 192 are inclined oppositely from those on the parts 199 and 193 for a reason to be hereinafter explained. The hub of the drum 171 is provided with a recess at 214, and a flange 215 formed on the collar 216 of the sleeve 210 extends into this recess. In the recess are clutch disks secured alternately to the hub and to the flange. The disks can be brought into or out of contact by turning the hub 212. Secured to the sleeve 210 is a spur gear 217 which meshes with the spur gear Re 

